diff options
Diffstat (limited to 'libguile/load.c')
-rw-r--r-- | libguile/load.c | 343 |
1 files changed, 0 insertions, 343 deletions
diff --git a/libguile/load.c b/libguile/load.c deleted file mode 100644 index b9a9fc8cc..000000000 --- a/libguile/load.c +++ /dev/null @@ -1,343 +0,0 @@ -/* Copyright (C) 1995,1996 Free Software Foundation, Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this software; see the file COPYING. If not, write to - * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. - * - * As a special exception, the Free Software Foundation gives permission - * for additional uses of the text contained in its release of GUILE. - * - * The exception is that, if you link the GUILE library with other files - * to produce an executable, this does not by itself cause the - * resulting executable to be covered by the GNU General Public License. - * Your use of that executable is in no way restricted on account of - * linking the GUILE library code into it. - * - * This exception does not however invalidate any other reasons why - * the executable file might be covered by the GNU General Public License. - * - * This exception applies only to the code released by the - * Free Software Foundation under the name GUILE. If you copy - * code from other Free Software Foundation releases into a copy of - * GUILE, as the General Public License permits, the exception does - * not apply to the code that you add in this way. To avoid misleading - * anyone as to the status of such modified files, you must delete - * this exception notice from them. - * - * If you write modifications of your own for GUILE, it is your choice - * whether to permit this exception to apply to your modifications. - * If you do not wish that, delete this exception notice. - */ - - -#include <stdio.h> -#include "_scm.h" -#include "libpath.h" -#include "fports.h" -#include "read.h" -#include "eval.h" -#include "throw.h" - -#include "load.h" - -#include <sys/types.h> -#include <sys/stat.h> - -#ifdef HAVE_UNISTD_H -#include <unistd.h> -#endif /* HAVE_UNISTD_H */ - -#ifndef R_OK -#define R_OK 4 -#endif - - -/* Loading a file, given an absolute filename. */ - -/* Hook to run when we load a file, perhaps to announce the fact somewhere. - Applied to the full name of the file. */ -static SCM *scm_loc_load_hook; - -SCM_PROC(s_primitive_load, "primitive-load", 1, 2, 0, scm_primitive_load); -SCM -scm_primitive_load (filename, case_insensitive_p, sharp) - SCM filename; - SCM case_insensitive_p; - SCM sharp; -{ - SCM hook = *scm_loc_load_hook; - SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, - SCM_ARG1, s_primitive_load); - SCM_ASSERT (hook == SCM_BOOL_F - || (scm_procedure_p (hook) == SCM_BOOL_T), - hook, "value of %load-hook is neither a procedure nor #f", - s_primitive_load); - - if (hook != SCM_BOOL_F) - scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL); - - { - SCM form, port; - port = scm_open_file (filename, - scm_makfromstr ("r", (scm_sizet) sizeof (char), 0)); - while (1) - { - form = scm_read (port, case_insensitive_p, sharp); - if (SCM_EOF_VAL == form) - break; - scm_eval_x (form); - } - scm_close_port (port); - } - return SCM_UNSPECIFIED; -} - - -/* Builtin path to scheme library files. */ -#ifdef SCM_PKGDATA_DIR -SCM_PROC (s_sys_package_data_dir, "%package-data-dir", 0, 0, 0, scm_sys_package_data_dir); -SCM -scm_sys_package_data_dir () -{ - return scm_makfrom0str (SCM_PKGDATA_DIR); -} -#endif /* SCM_PKGDATA_DIR */ - - -/* Initializing the load path, and searching it. */ - -/* List of names of directories we search for files to load. */ -static SCM *scm_loc_load_path; - -/* List of extensions we try adding to the filenames. */ -static SCM *scm_loc_load_extensions; - -/* Initialize the global variable %load-path, given the value of the - SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the - SCHEME_LOAD_PATH environment variable. */ -void -scm_init_load_path () -{ - SCM path = SCM_EOL; - -#ifdef SCM_LIBRARY_DIR - path = scm_cons2 (scm_makfrom0str (SCM_SITE_DIR), - scm_makfrom0str (SCM_LIBRARY_DIR), - path); -#endif /* SCM_LIBRARY_DIR */ - - { - char *path_string = getenv ("SCHEME_LOAD_PATH"); - - if (path_string && path_string[0] != '\0') - { - char *scan, *elt_end; - - /* Scan backwards from the end of the string, to help - construct the list in the right order. */ - scan = elt_end = path_string + strlen (path_string); - do { - /* Scan back to the beginning of the current element. */ - do scan--; - while (scan >= path_string && *scan != ':'); - path = scm_cons (scm_makfromstr (scan + 1, elt_end - (scan + 1), 0), - path); - elt_end = scan; - } while (scan >= path_string); - } - } - - *scm_loc_load_path = path; -} - - -/* Search %load-path for a directory containing a file named FILENAME. - The file must be readable, and not a directory. - If we find one, return its full filename; otherwise, return #f. - If FILENAME is absolute, return it unchanged. */ -SCM_PROC(s_sys_search_load_path, "%search-load-path", 1, 0, 0, scm_sys_search_load_path); -SCM -scm_sys_search_load_path (filename) - SCM filename; -{ - SCM path = *scm_loc_load_path; - SCM exts = *scm_loc_load_extensions; - char *buf; - int filename_len; - int max_path_len; - int max_ext_len; - - SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, - SCM_ARG1, s_sys_search_load_path); - SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list", - s_sys_search_load_path); - SCM_ASSERT (scm_ilength (exts) >= 0, exts, - "load extension list is not a proper list", - s_sys_search_load_path); - filename_len = SCM_ROLENGTH (filename); - - /* If FILENAME is absolute, return it unchanged. */ - if (filename_len >= 1 - && SCM_ROCHARS (filename)[0] == '/') - return filename; - - /* Find the length of the longest element of path. */ - { - SCM walk; - - max_path_len = 0; - for (walk = path; SCM_NIMP (walk); walk = SCM_CDR (walk)) - { - SCM elt = SCM_CAR (walk); - SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt, - "load path is not a list of strings", - s_sys_search_load_path); - if (SCM_LENGTH (elt) > max_path_len) - max_path_len = SCM_LENGTH (elt); - } - } - - /* Find the length of the longest element of the load extensions - list. */ - { - SCM walk; - - max_ext_len = 0; - for (walk = exts; SCM_NIMP (walk); walk = SCM_CDR (walk)) - { - SCM elt = SCM_CAR (walk); - SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt, - "load extension list is not a list of strings", - s_sys_search_load_path); - if (SCM_LENGTH (elt) > max_ext_len) - max_ext_len = SCM_LENGTH (elt); - } - } - - SCM_DEFER_INTS; - - buf = scm_must_malloc (max_path_len + 1 + filename_len + max_ext_len + 1, - s_sys_search_load_path); - - /* Try every path element. At this point, we know it's a proper - list of strings. */ - for (; SCM_NIMP (path); path = SCM_CDR (path)) - { - SCM path_elt = SCM_CAR (path); - - /* Try every extension. At this point, we know it's a proper - list of strings. */ - for (exts = *scm_loc_load_extensions; - SCM_NIMP (exts); - exts = SCM_CDR (exts)) - { - SCM ext_elt = SCM_CAR (exts); - int i; - - /* Concatenate the path name, the filename, and the extension. */ - i = SCM_ROLENGTH (path_elt); - memcpy (buf, SCM_ROCHARS (path_elt), i); - if (i >= 1 && buf[i - 1] != '/') - buf[i++] = '/'; - memcpy (buf + i, SCM_ROCHARS (filename), filename_len); - i += filename_len; - memcpy (buf + i, SCM_ROCHARS (ext_elt), SCM_LENGTH (ext_elt)); - i += SCM_LENGTH (ext_elt); - buf[i] = '\0'; - - { - struct stat mode; - - if (stat (buf, &mode) >= 0 - && ! (mode.st_mode & S_IFDIR) - && access (buf, R_OK) == 0) - { - SCM result = scm_makfromstr (buf, i, 0); - scm_must_free (buf); - SCM_ALLOW_INTS; - return result; - } - } - } - } - - scm_must_free (buf); - SCM_ALLOW_INTS; - return SCM_BOOL_F; -} - - -SCM_PROC(s_primitive_load_path, "primitive-load-path", 1, 2, 0, scm_primitive_load_path); -SCM -scm_primitive_load_path (filename, case_insensitive_p, sharp) - SCM filename; - SCM case_insensitive_p; - SCM sharp; -{ - SCM full_filename; - - SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename, - SCM_ARG1, s_primitive_load_path); - - full_filename = scm_sys_search_load_path (filename); - - if (SCM_FALSEP (full_filename)) - { - int absolute = (SCM_LENGTH (filename) >= 1 - && SCM_ROCHARS (filename)[0] == '/'); - scm_misc_error (s_primitive_load_path, - (absolute - ? "Unable to load file %S" - : "Unable to find file %S in load path"), - scm_listify (filename, SCM_UNDEFINED)); - } - - return scm_primitive_load (full_filename, case_insensitive_p, sharp); -} - -/* The following function seems trivial - and indeed it is. Its - * existence is motivated by its ability to evaluate expressions - * without copying them first (as is done in "eval"). - */ - -SCM_SYMBOL (scm_end_of_file_key, "end-of-file"); - -SCM_PROC (s_read_and_eval_x, "read-and-eval!", 0, 3, 0, scm_read_and_eval_x); - -SCM -scm_read_and_eval_x (port, case_insensitive_p, sharp) - SCM port; - SCM case_insensitive_p; - SCM sharp; -{ - SCM form = scm_read (port, case_insensitive_p, sharp); - if (form == SCM_EOF_VAL) - scm_ithrow (scm_end_of_file_key, SCM_EOL, 1); - return scm_eval_x (form); -} - - - -void -scm_init_load () -{ - scm_loc_load_path = SCM_CDRLOC(scm_sysintern("%load-path", SCM_EOL)); - scm_loc_load_extensions - = SCM_CDRLOC(scm_sysintern("%load-extensions", - scm_listify (scm_makfrom0str (""), - scm_makfrom0str (".scm"), - SCM_UNDEFINED))); - scm_loc_load_hook = SCM_CDRLOC(scm_sysintern("%load-hook", SCM_BOOL_F)); - -#include "load.x" -} |